Drain-valve for cylinders.



No. 797,288- PATENTED MTG.15, 19051 J. A. KENNEDYMDGREGOR & Ha WHEN. DRAIN VALVE FOR GYLINDEREL APPLICATION FILED H13. 23. 1904.

2 SHEETS-SHEET 1.

No '797,288. PATENTED AUG. 15, 1905. J. A, EENNEDY-MOGBEGOR is H. WHEN.

DRAIN VALVE FOB; CYLINDERS.

APPLICATION FILED FEB. 23, 19M.

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JOHN ALEXANDER .KENNED T-IWCGREGOR AND HARRY WHEN, OF BIRMINGHAM, ENGLAN D.

DFIAIN VALVE FOR (DYLINUEWBM Specification of Letters Patent.

Iatented Aug. 15, 1905.

To (LU when), it Tit/Ly concern:

Be it known that we, JOHN ALEXANDER KennnDYMeGnEeoR, engineer, and HARRY Wines, manufacturer, subjects of the King of Great Britain, and residents of 15 Aston Road North, Birmingham, in the county of VVarwick, England, have invented certain new and useful Improvements in Drain-Valves for Cylinders oi Steam-Engines and the Like Purposes, (for which we have applied for a patent in Great Britain, No. 18,136, dated the 22d day of August, 1903,) of which the following is a specification.

This invention relates to improvements in drain'valvcs for cylinders of steam-engines and the like, and has for its object a doubleacting valve which is particularly adapted for use in connection with condensing-engines, such valves when under any pressure whatever being entirely free from any direct passage of the live steam outward or any direct inward passage of the air, as all air, steam, or water on either side of the valve is only allowed to pass into a small intermediate valveehamber which upon being opened at the exit is closed at the entrance, and vice versa, the same arrangement operating upon both sides of the valve.

In order that this invention may be clearly understood and more easily carried into practice, we have appended hereunto two sheets of drawings, upon which we have illustrated the nature of our said invention.

Figure 1 is a sectional elevation of a valve in the normal position with all pressure removed. Fig. 2 is a sectional elevation of the same valve as that illustrated in Fig. 1, but showing the valve balanced with the pressure equal on both sides. Fig. 3 is also a similar sectional elevation to that of Fig. 1, but showing the valve with an excess of pressure on the right-hand side. Fig. 4: is a similar sec tion to that of Fig. 1, but showing a modification in which the double valve is formed in one piece.

In carrying this invention into effect the double-acting draining arrangement consists of a pair of double valves A A and B B, each pair of which are respectively connected together by the spindles or stems a 5, the one spindle a? being telescoped within the other, 7/. These valves are mounted in the horizontal cylindrical casing or pipe C, the valves A B being normally retained together by the expansion-spring E, and when free from any pressure rest centrally over the drainoutlet F, with each side of the valve open, respectively, at J J and K K to the atmosphere and the cylinders draining freely, as illustrated by Fig. 1, the position 01'' which can only occur when all pressure is removed. Upon an equal pressure from the cylinders on both sides at M and N the valves A and B are open at J and K, while A B are closed at J K, thus preventing any of the escape of the live steam; but immediately upon the balance of pressure being disturbed the action of the excessil, for instance, from the right, as illustrated by Fig. 3 will have the result of closing the inner valve B at K and opening the outer valve A at K, thus preventing any emission of live steam during the change and at the same time opening up the intermediate valve-chamber R to the atmosphere for draining purposes. It will be seen that during the time either valve is closed under an excess of pressure, as shown, for example, by B, Fig. 8, the inner valve A upon the reverse side is open to the intermediate chain ber S, but is closed to the atmosphere by the outer valve B, thus preventing any inward access of the air through that side of the valve, and thus rendering the drainer applicable for use with a condenser and vacuum.

The telescopic parts a Z)" are secured together by the cross-pin a, which is fixed in the valve part A and passes through and slides in the slot [1 in the stem or spindle 6 In some cases the parts A A and B B may be formed in one piece, as illustrated by Fig. A, in which case it will be seen that the same result is obtained in each case. with the exception of the balanced position. (Illustrated by Fig. 2.)

Having now described our invention, what we claim as new, and desire to secure by Letters Patent, is--- 1. A drain-valve for the cylinders of steam- I engines and the like, consisting of a casing having two inlet-ports and an outlet-port, two sets of duplex valves mounted on telescoping valve-stems operable to control the inlet and outlet ports and a balancing means to maintain each set of duplex valves in its initial position.

2. A drain-valve for cylinders of steam-engines and the like consisting of a casing having an outlet-port and two inlet-ports and two sets of duplex valves operable to control such inlet and outlet ports, each set of duplex Valves mounted upon a valve-stem and operable independently of or in conjunction with the other set and a balancing means to normally maintain the two sets of duplex valves in their initial position. Y

3. Adrain-valve for the cylinders of steam engines and the like consisting of a casing having an outlet-port and two inlet-ports and two sets of duplex valves operable to control such inlet and outlet ports, each set of duplex valves mounted upon a valve-stem and operable independently of or in conjunction with the other set, such valve-stems constructed to telescope one within the other and a balancing means to normally maintain the two sets of duplex valves in their initial position.

i. A drain-valve for the cylinders of steamengines and the like consisting of a casing having two inlet-ports and an outlet-port, and

a set of duplex valves operable to control the inlet and outlet ports each set of duplex valves consisting of a valve-stem and two valves mounted thereon, the outer one of which is arranged to control its respective inlet-port and the inner one arranged to control the passage from the other inlet-port to the outlet-port, the two inner valves being upon the opposite sides of each other to their respective outer valves and the valve-stems being arranged to telescope one within the other and a balancing-spring to normally maintain the valves in their initial position.

In witness whereof we have hereunto set our hands in the presence of two witnesses.

JOHN ALEXANDER KENNEDY-MOGREGOR. HARRY WREN.

lVitnesses:

WVALTER H. E. BARTLAM, LEWIS W. Groom). 

